[Hexagon] Make sure to zero-extend bytes before building a vector

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319204 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 0 deletions

diff --git a/test/CodeGen/Hexagon/build-vector-v4i8-zext.ll b/test/CodeGen/Hexagon/build-vector-v4i8-zext.ll
new file mode 100644
index 00000000000..b39426a723d
--- /dev/null
+++ b/test/CodeGen/Hexagon/build-vector-v4i8-zext.ll
@@ -0,0 +1,17 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+
+; Check that we generate zero-extends, instead of just shifting and oring
+; registers (which can contain sign-extended negative values).
+; CHECK: and(r{{[0-9]+}},#255)
+
+define i32 @fred(i8 %a0, i8 %a1, i8 %a2, i8 %a3) #0 {
+b4:
+  %v5 = insertelement <4 x i8> undef, i8 %a0, i32 0
+  %v6 = insertelement <4 x i8> %v5, i8 %a1, i32 1
+  %v7 = insertelement <4 x i8> %v6, i8 %a2, i32 2
+  %v8 = insertelement <4 x i8> %v7, i8 %a3, i32 3
+  %v9 = bitcast <4 x i8> %v8 to i32
+  ret i32 %v9
+}
+
+attributes #0 = { nounwind readnone }